close

Privacy guaranteed - Your email is not shared with anyone.

Gen4 21 to 10mm

Discussion in 'The 10 Ring' started by Quarter Tank, Aug 5, 2012.

  1. Quarter Tank

    Quarter Tank

    Joined:
    Aug 7, 2011
    Messages:
    503
    Likes Received:
    0
    Location:
    ATL
    Okay so I want to make the plunge to 10mm and was trying to hold out and get a Gen4 20 but decided to transform my 21 to 10mm.

    Question, will all aftermarket barrels, kkm, LW etc fit in a Gen4 without modification? Will my Gen4 rsa work with an aftermarket G20 barrel. Will I need a 10mm extractor?

    Thanks in advance.


    Outdoor Hub mobile, the outdoor information engine
     
  2. alwaysshootin

    alwaysshootin

    Joined:
    Nov 14, 2005
    Messages:
    3,758
    Likes Received:
    6
    From what I've heard/read, yes they will. If you are open to advice, take a look at what you will have tied up, monetarily speaking, in converting your 21. Make sure to add in the cost of a couple of mags, you know you'll need those! Then check what you can get into a used G20 for in your area. They usually come with at least two mags. You may just find it to be beneficial, to go with another firearm, to get you your G20.:cool:
     

  3. larson1122

    larson1122

    Joined:
    Jan 30, 2012
    Messages:
    1,801
    Likes Received:
    0
    Location:
    Minnesota
    :goodpost:

    As far as the extractor, you may need it and you may not. From what I understand some people have no problems using the stock 45 extractor with 10mm and others have needed to modify it in order for it to run reliably. I would try it out before doing anything with the extractor and see how it goes. I believe your stock RSA will be fine with 10mm as well.

    I'm going to have to agree with the above advice and suggest looking into a used G20 or waiting a little while longer for the Gen 4 if that's what you really want. If you end up liking the 10mm (I'd be willing to bet you will love it), then I'm sure down the road you will want a dedicated gun in 10mm anyway. By the time you buy the conversion barrel, mags, etc. you are very close to the cost of a used G20, which can be found quite easily in good condition.

    I have a Gen 4 21 and really enjoy it, but I picked up a G20SF recently and am glad that I don't have to mess around with conversion barrels and extractor modifications.

    Good luck and enjoy the 10mm! :wavey:
     
  4. Quarter Tank

    Quarter Tank

    Joined:
    Aug 7, 2011
    Messages:
    503
    Likes Received:
    0
    Location:
    ATL
    I might go ahead and pick up a 10mm barrel regardless. I want to use a KKM barrel over stock even if and when I get my G20.

    Thanks for the helpful advise. B

    Outdoor Hub mobile, the outdoor information engine
     
    Last edited: Aug 6, 2012
  5. humphreys19

    humphreys19

    Joined:
    Feb 4, 2011
    Messages:
    167
    Likes Received:
    4
    You will not be able to use a .45 to 10mm conversion barrel ( what you need to convert your G21 ) in your future G20. The barrel hoods are different widths, due to the difference in breech face width between .45 and 10mm. This is the same reason you can't just drop a 20 barrel into a 21 to convert.

    Tom
     
  6. Yondering

    Yondering

    Joined:
    Dec 3, 2011
    Messages:
    564
    Likes Received:
    2
    You can just drop a 20 barrel into a 21. It works great. The barrel hood is too narrow, but the sides of the barrel aligned in the slide perform the same task; no issues there.
     
  7. humphreys19

    humphreys19

    Joined:
    Feb 4, 2011
    Messages:
    167
    Likes Received:
    4
    Yondering,
    That's news to me. I thought I was up on the 10mm conversion thing, and you tell me the 20 barrel will work in a 21? I thought the conversion barrel was needed. You have done this? How is reliability, feeding, ejection, etc.? The narrower barrel hood causes no problems? Do you need to change or modify the extractor?
    It doesn't really matter much to me anymore, because I recently acquired a 20SF, but I am always curious about conversion possibilities.
    Thanks, Tom
     
  8. WeeWilly

    WeeWilly

    Joined:
    Nov 12, 2011
    Messages:
    6,341
    Likes Received:
    3,221
    Location:
    Idaho
    The barrel fits fine. There is a gap on both sides on the hood where it contacts the breech face where the wider 21 slides fills, but otherwise it fits fine. The extractor doesn't sit as far in, so I suppose you could have feed issues, although others here have reported no problems with the extractor. There is a mod for the 21 extractor that files the button that provides positioning that supposedly allows the 21 extractor to sit deeper without affecting reliability in 21 mode.

    Another difference is slide weight. The 21 slide is lighter than the 20, so if you shoot real 10mm rounds, slide velocities will be higher, perhaps problematically as pressures go up.

    I agree with others that say to get a dedicated gun, minimally, I probably get a complete 20 slide assembly, then you have factory/duty reliability on your hip.
     
    Last edited: Aug 8, 2012
  9. Yondering

    Yondering

    Joined:
    Dec 3, 2011
    Messages:
    564
    Likes Received:
    2
    I use a 10mm 6.6" Lone Wolf G20 barrel in my 21 slide with no other modifications. I have not had any issues with it, function is 100%. I do use a muzzle brake on it, because the lighter slide of the 21 is a significant difference. The inner sides of the slide locate the back end of the barrel, doing the same job as the barrel hood. Accuracy doesn't seem to be compromised with this setup.